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Finding the Fourth Proportional to 643,732.70, 965,599.05 and 405,787.10

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Solution

The fourth proportional to 643,732.70, 965,599.05 and 405,787.10 is: 608,680.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,732.70 : 965,599.05 = 405,787.10 : x
  2. Step 2: Convert to fraction form
    643,732.70/965,599.05 = 405,787.10/x
  3. Step 3: Cross multiply
    643,732.70x = 965,599.05 × 405,787.10
  4. Step 4: Simplify right side
    643,732.70x = 391,827,638,262.26
  5. Step 5: Solve for x
    x = 391,827,638,262.26/643,732.70
  6. Step 6: Final answer
    x = 608,680.65

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.